The Yarn Cozy is made of elastic fabric and stretches around your ball of yarn to keep it safe and clean while you knit. Want to keep your yarn safer from curious kids and pets? How about helping keep your yarn tangle-free or clean if it hits a dirty floor? Then yarn cozies are for you! Works with center-pull and outside-pull balls of yarn. These are flexible yarn ball sleeves yarn ball cozy for center pull yarn ball,work with 3 oz to 6 oz yarn ball,when you use this item to hold your yarn ball, these sleeves keep your yarn cakes or balls perfectly cozy,clean and tangle free while you arr knitting,they are easy to travel with.